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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17f62447f8b1ab436cae365a8b875db0e5969d4ca123f89f8ed639b667e2bf46' 
  AND token = 'Cm5Wn5Zw5e4Gg31RwtYCkSkYKKPIcKg1ukcWRa97iKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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