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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bad3140b2c54b20976b87493ef674755f5da2c271e37af9dbcf3981c3aaaa11' 
  AND token = 'aJmDYQ/ey20wLaxzeRGPP9duq+oPhl5/200S1Ux3DOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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