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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e11e3211f64fa426d89446ed5b398e9de3cb2937c203077cb17d9a61b8480759' 
  AND token = 'AIAXlJHte8W6ZXg3vxTKIExk5IL7mzCoUZr43eTG6CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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