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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '762a6b96657b84c6f4fe4d399e24543f85ca4b2ee7a7c3047654376985e65e4d' 
  AND token = 'Kjsv8rEDc8Les163cNfSv7LCVNgw/3IpfwEQJvoSVW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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