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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e2509358699cb61409a13a973cbec474f8ac0cc55882be30539fcb9509bb26' 
  AND token = 'P/bBYgOr3us7P8/52wM2yzeU8+kKbStzf9kWxBI6Zas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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