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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0aa79c75307e3a8dc9dd01c890308e9618a5c257c7a4d0acb0a0780a4f497a53' 
  AND token = '79H3Pu5tmGYl/6hdLzNNBFiolY1QrYMMald1cngNcSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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