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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99f77dc60d140f9a4f868de3935eeb8f60de2abfc299dd0da982c3ae5071d52f' 
  AND token = 'Dw0zQG1q9Ign5om/oa2fK7t6maVp8aX7QTLx+p5N2CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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