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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9817fb6d5bd4e1bb3d2b8d2316a4b0fd416ecbe6874e01c1c784aee3f5aa3092' 
  AND token = 'z49/yT2Sf2OE2DLKr75t77WFwW/69kWwZmrQMeR8fok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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