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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '765b84d1fb9ce4b2e35248139dd3a514bc3a808cda8035e0d71b1b0bbe733371' 
  AND token = 'GeyQk70nPn49Uj7rZR1N8h7+UmfwrxLkLowt9TAm2Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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