SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce7844d07de5d83687c76dcdc4b21f9f3255502abcf7f82fe02ad66227d1031e' 
  AND token = 'ZqTfGwVkCRsJOkSv40kYr28Otlb5bgheV5Rp+sKnX9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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