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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96e6260aa9f62432fd1c0b69b1b2f7c28cc8127fdd9799123b612965d7a55932' 
  AND token = '1ITYhG8Ih5dun+WHl+kTR6Ijv0avj0eTy4mCR3hkwuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}