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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26e161bde5974c26266b7a6a676318b7945c3ce6f67e83358eebe79353e4cf57' 
  AND token = 'eIBlZxlXjGpzP9wN8zkMIjQMXELbzrz4nO9z5jazrqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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