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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdab344f2f96a915fa013dc93842e3ccec95cc4b01ddc71275241666033b33b0' 
  AND token = '3tEP9Mkt4yOJPO6/VA7mdIkvlqyGkMfVBbIXVtkJlkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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