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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4105170cd3abfceaee0f828dbaf51c4fbe39768e0e996df61f9eb23cc23a9dc9' 
  AND token = 'uDLSW54iLdt7vugH6tHWn0VDYU2Yp8aUV/RL38qzNzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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