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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e968b267be4888ddaf97e7f88da301ce1839104278cb9187ed212a06fe2372ab' 
  AND token = 'kS4CdIF69FdYs9ZwWccHuWw5KKvYrt7lWU0LN8Va2Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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