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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a40bb749678467d51528fa74468c270158a65de3f3fb4e225008efc4dab139c2' 
  AND token = 'dXlErjyi5EMupwBXaKXYrtIuhdDb6uT/XgO9ILNi75A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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