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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ad80f202da737928dd97780fe30e1860faf7ac887f86189d189220ff0612c28' 
  AND token = 'QbIOKNc0z2G2do6ZkvVVug55rZBZvJHldVDrAaMTBvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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