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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '763994e545cb7fb339118e06417f83ee72596809ea972f56e01544bcfd698c4d' 
  AND token = 'fs/IiSF/Gs7yx2QtsekT7qOxZ4ESX86Do8wcARLhsrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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