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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb96a3f85b05820eaec2e441dd67a3035fb04292d9cfbc723bd621c01cc7c8d5' 
  AND token = 'UXcXpe3EE378+NLtucv/QC7G7ZBhDwUzeOokR05Q/vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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