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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8d2ca34ee3366eb6e53883ff5ee0dd2729dac455e0bdd91c09fbc998fab0ad5' 
  AND token = 'xMXtQZ8YxX7t8QbzEmbD0QzTF5DoiztbABU/K3FwfvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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