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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '332efff1005adca79b99780c244d9728ffe50b181c5476673465dd42ef13899b' 
  AND token = 'Ssc8r2lrQ66rKWiSc6/QbyTGqANmBlLEXibSLTqo7Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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