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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3c8abc5f4bf2aaec42b241e2224fe16b5a3950938bc40d7075d50d3a88c7410' 
  AND token = 'e2hIisy9lm954LpoFN/l7wgFf+z0OIUqXcqtRz2SzMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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