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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce3e625a965fdd193b314daddc41a7ba4a53bebe7069578264f8a782536a1416' 
  AND token = '3KKX39JrBytb48kSoHEE65bYHefzMTQB1RIJnLxtEg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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