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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9559901903cd0d8c0ffe2c3e2f57df3110aeb00112108da24c8d4d773efa11a' 
  AND token = '8Bng9QGYS6QHVvHmHbnJiP6gYJmbf7p0PiiTDuupCiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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