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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda864bb466d4a58d70f76f752e31b5d1edb9f19906b55170fa4859d930186db' 
  AND token = 'kgWKZE0h3MPwIgvjjLiXF8uEpj65GM5JiING5E5IndA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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