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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b9628fc4a772678f206f91a00ca11f7cbc726e2f0c5edea7b0ff9a76b193ca2' 
  AND token = '4AYY0DLr9CnyZyKcMciPQi6sRi9/PWBUGsL8tt+Izmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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