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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95a646443966f89f2d03e0fe1e7dd25b444eb05562f0fabdc33506ca0a319641' 
  AND token = '2rjDv7Jcgtk3XuNl5HjqYjzDJTt4oi9wNfnOemdj7K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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