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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9afebfe1e43336bcea46b4f4024eca4fd38a40ffb35b0e88e6c4282ed8d2b21b' 
  AND token = '3WY5/VtUlJG3/KEr4BsrORTrlO7RhdqLfsXDdmF19N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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