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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3138ea9584db5d3dcbd026d127ac9eee8c2f823466edf4c5436fed79a45b0975' 
  AND token = 'q3SmO2LGmMCE5VWdmXo+O1eQyRl6xfk9dVwSWVok4r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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