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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71e48d17c45b3d405a6406f0b3eb2e6a19590af691a93366ecd7d44757ea8bbd' 
  AND token = 'w1V78fHEunbwmpEJFbyVX0mbr+6mCCUGSeqpY8oTrdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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