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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f96c2711c8ad9268c922e6281fa4a143ed52eb72a55fc22b02c802bc4bd9ea9' 
  AND token = '16wcoPFMUlGLLL1813Wm+Zj1q5xSo5adM7NOzatgqR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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