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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15797cf962f5545210f4a0f7a791f2dafe2f9e9feb29c98911ba18b844b86fe7' 
  AND token = 'Wv0ay27h9g4NwxKDAcyPChQfoO2dHpf2oE6Xq9yLd9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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