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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8e3fdd08b72e1d908cbf4ed874e4f1d7c95bfe05e5a4834d7475873f79447a3' 
  AND token = 'p/pjeBdALGXi+A9y49x+QJ8HCoT1FCCUPZ4zXNYshlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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