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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '451ce20efe853c1b299a183af37f4973764cf8d8ae4d1d53f39e1938c610cc54' 
  AND token = 'aoOutvSa97TWzO/EPgQo5Gbe4KeCL83NJsvXfc+aEFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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