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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea27c65dc6275a3db49084475998413777a9385a781d62eddc9194af83e2ac2' 
  AND token = '2QQyPymzsb65mNW7vocbLpK8Hx47/0a0Q1cLPeYp9jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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