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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa8a2a8d0b779c440ae420bd1a6009696b83e7b5067e74f0cf6c3228d8095aa5' 
  AND token = 'TfDfPzDedUnEq4QoO6n67T/WB0+OsDOAECy5y3qTbqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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