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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '491f0c8d52cf215f9de77b42b0ebfd0e111f4ee5af9bfe2dd943c450cbf1cd4b' 
  AND token = 'trFpRz/5zTde5shi/VcURTszpxXJN5l81hWGiwApP1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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