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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0782edcc7362c46c18b91d498095a6379d6e7673336e507ff8a2db94fe97daf9' 
  AND token = 'wLRC7uuNNuvDD/tLPDBSP0RiAu+UDLrdd6urm2mIEFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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