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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c03c4bbea2ad83cbdd5bd7ab980209b1ad13ececa6206af77de5927c1cefd601' 
  AND token = 'VWOqiF2f95tjzAElh/NyPiC9P7/i6+DNpRd9sj0QcV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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