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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bdb6d70a2ba1d3ba61097420778453e9b99dbf0ff4021bf39aac98445f6d7d8' 
  AND token = 'ru27AkICFOKPfEM8nHRdRfaBK7iAP+qX9Bv62pb0Y8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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