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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccf55045df848d4cc5950185e3d0ffac4e41b55bcacb62f8941c380fbafcbff4' 
  AND token = 'hYU3z+dpKPNmaQ4l5KZxkESpLMWfzlI9fIFQQEsIH4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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