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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebe2f67da58615a685ffd7dd5700728a7251264c8fb5ea0f1a8e3d3ce0651a22' 
  AND token = 'L+q94BXRyD11Sz0z+L+rJRiRrMw1Vjgfua7KOdTFeQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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