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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de4d72fa9ee7fa27a0ad27eab1c601fd5a790d999714c56c7b856f9fc1ca0905' 
  AND token = 'cloXHguqjORoP9nSUW1MT3sIh+z0xq9cnihW1TpHm6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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