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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0d8702ea742a61dbde81f4710c02f0aa8c37db14c9a32f187b3b10670c8e204' 
  AND token = '7lgxyRKelxFXRCjhyj68i+zAENwW1tocNQFlXeTCBh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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