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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92c95b1d5e275c42c5a445df569f811d496471d03d3dfa88f2905ef242c2769e' 
  AND token = 'F+S+p8ImFeplzPmUA/aXHMw6k2QMxAckrA1EvB96S3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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