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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44292f755640803269ecdeb5d11347125396b90b29eb2b49c1e0550c81839ea3' 
  AND token = 'UqPmsxsBgPdySr8vn4EJwYXUkgkAL8ZY0dg/rASxgb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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