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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f2ebe081f157321a9ed34e579b7c7d56db54b7cbc1873fbd192cff0db63c1ee' 
  AND token = 'MxZMcgHNCOxXTwSn1XGqOk9V2jiX8Qj4DhBiXET7jEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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