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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '771f86c8cdae895c793b22e7247b0754ec77cefc399fc4f0e1fc0daf7aba5286' 
  AND token = 'XMeiNVqbsYP2m5+Z9daXUdohGqEThpixUlbVYU9YO6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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