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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8dab1b0f8f8743b940c45e5efcfca2758b79ccf051c350aca37eb5f64df0184' 
  AND token = 'c6PiAfrpWitsKTLtQH8eD2UkY9M3+w5WaKlaiYdgYIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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