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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f63cc6048b33213de720caf1dd0e96d3cb9cfe6fcaec10e8530f9cb76cdcc31e' 
  AND token = 'uMrPMr+YUC++3rFlxfplfdUy2/wHRpN3udSVuzQXwkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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