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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '562d0af3e7900c573a61b7aa5a844a313538ee42241ff7763ad6a70186395b26' 
  AND token = 'gTPCEdoGPv+EyxL/nFsZkp1f6EbhxD3Xc1MzZdYjD30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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