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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98c925fbbb66c330783db0145d1cd2b28c03e71b0fd7eeea9bb9024b903069c8' 
  AND token = 'DF+vmKI01ZfDffwM6IzLAei3UKcUeGfses/M1s1541g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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