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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c31e35093ce2b66055f0826fa6c2c2168119effa3d0e8762f7fb6c6b2a2f1d8' 
  AND token = 'zxYjCyLRhsjDepjQmmUMXo4IrvCCxtw7hhV0bVxAdoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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