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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6093260fd1a5ad3f7ab7e4db2bbd5dac283802c8a3eb27d3c7cdbb6dbf7d303' 
  AND token = 'Afyb1x8FSR4uP5C0pvi1yj9Djl/d1DjI+QHeEfgZ/lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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