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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47f39d51d1985d9473e88d65ab010dc68efff38e163a115d34a412f10249b346' 
  AND token = '/bELd0+XnTuPWwOLo2zT08yrv2G0u5plNt48Th6Iqls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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