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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05076c1aaada2be8916de8b3e41cfc135207e13dfb58f9d2b9797055e4b1c7f9' 
  AND token = 'yTlkONBP9Grpbaburja3LIo5f3wx810frCuEoPZsRmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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