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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3f59652819c60b4a17fc3d9036ff51b42c01dce20aec8e4908c09066c7ff480' 
  AND token = '9aAgzzrFE+BWryGtQsC+BQxPn3fmMdgrt+O1WPVHN30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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