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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff7fa56233d841f88f23f64029df2e32a8839f195ed0fc42ce9f856a4e06cca4' 
  AND token = 'l/Fg1uup7u65RXqPfTh4rcB9an4Ssktj8XXiSl1k/DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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